Animations
This page contains animations corresponding to signal analysis of fMRI data.
Our initial motivation for voxel intensity analysis results in the first set of animations. An experimental analysis of the fMRI data indicates that the individual voxel intensity values for each time instant does not possess any discriminative power among the classes. On the other hand, there is a slight variation on the intensity values along the x, y and z axis.
First set of animations show 3-dimensional distribution of voxel intensity values, for a time instant t. Note that the intensity values smoothly vary in the neighboring voxels.
| Voxel intensity values among x, y axis | Voxel intensity values among x, z axis | Voxel intensity values among y, z axis |
The second set of animations visualise the signal difference (sum of squared distance) of each voxel from its n-nearest neighbors in time t.
| Signal difference from 10 nearest neighbors | Signal difference from 100 nearest neighbors | Signal difference from 1000 nearest neighbors |
The above observations show that the spatial relationship among the voxels carries more information than the individual voxel intensity values, at each time instant.
All animations can be found here